linux-kernel - Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill kthreadd_task_init

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Message-ID: <m18wgbc0g3.fsf@fess.ebiederm.org>
Date:	Fri, 18 Sep 2009 16:11:56 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>, Wu Fei <at.wufei@...il.com>,
	Ingo Molnar <mingo@...e.hu>, arjan@...radead.org,
	jeremy@...p.org, mschmidt@...hat.com, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, tj@...nel.org,
	tglx@...utronix.de, Andrew Morton <akpm@...ux-foundation.org>,
	linux-tip-commits@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 0/1] kthreads: simplify !kthreadd_task logic, kill kthreadd_task_init_done

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> On Fri, 18 Sep 2009, Oleg Nesterov wrote:
>> 
>> Not sure I understand... We don't have CLONE_PID, and kthreadd()
>> shouldn't have pid == 0 anyway.
>
> Ahh, we got rid of CLONE_PID a long time ago, and renamed it to 
> CLONE_IDLETASK (which was what it was used for).
>
> As to why pid == 0 wouldn't work, I don't know, but I'll take your word 
> for it.

It probably would work but it would not be visible in proc  Making a kernel
thread that actually does work seems undesirable.

Eric
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